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You have to remove the five small screws on the lower edge of the iMac to remove a strange bracket or something, like the 21.5” 2012->… iMacs
The only thing that fan is doing is moving a (tiny) bit of air indirectly across the logic board and the heatsink. Or at least that is what I think it does. As there is no direct heat conduction from logic board to case, the fan isn’t there to cool the case, that’s for sure.
I fixed it right now!
Why is everithing so yellow? Was it put outside?